William c



(No Model.) 2 Sheets-Sheet l.

W. C. BORD.

Err-MAGE. NOQSBJ'Z. Patented Aug, 12., 1884. l

:lk Lu m 1 1 1 y 1 il a M Y '2 Sheets-Sheet 2. W'. G. FORD. l

PURNAGE. Patented Aug. 12, 1884.

-(N0 Model.)

x J l man VILLIAM C. FORD, OF BROOKLYN, NEX-V YORK.

FURNACE.

SPE QIIE'ICATION forming part of Letters Patent No.303,272, dated August .12, 1884.

Application filed November 10, 18H3. (No modelJ the furnaces of steam-boilers, but is not'limgitudinal section.

.ited thereto` In the drawings, Figure l is a vertical lon- Fig. 2 is a cross-section at the line e e, looking forward. Fig. 3 is a secf` tional plan at the line sv as; and Fig. 4 is a Ver 2o4 tical section at the line y fy, Fig. 3. i

The ash-pit A is surrounded by a double wall, a Z1, for-ming a line-space, c. The air is admitted at the opening c', or it may be forced in at this opening by a blower. The air-flue c traverses three sides of the ash-pit A, and crosses in the .trunk (l, below the ash-pit door D, which door D is to be closed air-tight, or nearly so, except when the ashes are being removed. The airfrom the trunk d ascends in the hollow trunk e to the hollow cubical chambeis c', thence by the horizontal pipe f to the hollow eubical chambers g g at the back end of the hre-chamber F, thence forward through the air-pipef and by the {hollow cubieal chambers 1i h tothe pipe j"2 and its rear cubical chambers, g2. Itis to be understood that the edges of the hollow cubical chambers that set together are preferably grooved and ribbed, as shown, to receive cement, and that the parts are bolted together.l The tubes j' f f2 form oneside of the firechamber F; The dre-door at G is of any suitable character. The chambers at the ends of the respect-ive pipes, being cubical, are easily huilt into the brick work, and one range of pipe is made to support another in a iirm'reliable manner. The Aconnections are easily l made at the top, bottom, or sides of such cubical chambers, and the parts are not liable to become separated by changes of temperature and expansion or contraction. The other side of the hre-chamber is made ol" similar horizontal pipes in a Vertical range. The air passes across from the pi pc ft to the pipe Z by means of the pipe h, having hollow cubical chambers h3 h, that connect with the hollow cubicil 'chambers gi and k It of the respective pipes f2 and Z. The pipeis in the hollow bridge wall L, more particularly,described hereinafter. Inthis bridge-wall, at one side, is an opening, M, for cleaning purposes. opening is generally closed by a door. The air now passes along horizontally through the pipe Z, and by the hollow cubical chambers l and m to the pipe mf, and thence by the cubical chambers mt and a to the pipe o and ijs cubieal chamber at. These pipes Z m a and their respective cubical chambers form the other side of the fire-chamber` F. It is to bc understood that these tubes are to be inclosed in brick-work at their outer sides, as shown at IQ and that such brick-work extends up sufficiently vhigh to receive the steam-boiler, in any usual manner.

There is a hollow cross-bearer, o, below the lire-door, and this has a ledge, o, on its inner face, upon which rest the ends of the grate bars l?, and there is a similar ledge, o2, at the face ofthe hollow bridge-wall/ upon which the grate-bars rest at their inner ends. These gratebars are of any desired size or shape; but I prefer bars with cross-pieces between the longitudinal portions, as shown.

Beneath the grate-bars there is a'range of tubes, R, passing at their -front ends into the hollow bearer o and at their rear ends into the hollow bridge-wall. These tubes are perforated; hence a portion of the atmosphere which has become highly heated by traversing the respective pipes at the sides of the lire issues from these perforations and passes up through the bed of incandescent fuel on the grate-bars. The remainder of the highlyheated atmosphere passes into the h'oilow bridge-wall.

The bridge-wall L will usually be built of lire-bricks with the internal air-space sufriciently large for the passage of the pipe h andfor the tubes R to open into such air-space r)Shere is aslab, r, covering thc air-space of the bridge-Wall and forming the top of such bridgewall, and through this slab are holes This v IOU that open into the hollow bridge-wall arch N, with itscentral hollow partition S. This hollow arch and partition are preferably made of fire-clay molded and baked, or of iron, and in either separate pieces or joined together. The atmosphere in'its highly-heated condition ascends from the hollow bridge-wall into the hollow arch and partition,and escapes through openings at t t into the products' of combustion as they pass over the bridge-wall, and in so doing any unconsumed carbonaceous matters are burned andthe most perfect combustion insured.

If desired, there may be a pipe, o, extending baekwardly from the hollow partition, and terminating in the perforated T-head to more fully distribute `the highly-heated air among the escaping products of combustion.

vrlhere may be a steam-pipe introduced into the tubular cross-beam o, with nozzles opening into the tubes R, so that the atmosphere may be drawn through the heating-tubes and driven by the steanrj'ets into the perforated tubes and the hollow bridge-wall, instead of usinga blower to force the atmosphere into the hollow wall of the ash-pit, or there may be pipes and steam-jets introduced into one or more of the air-tubes, so as to promote a rapid circulation of the air through the heating-pipes and the delivery of such air into the combustion-chamber.

I claim as my invention l. The combination,\vith the gratebars and inclosure forming the fire-chamber, of tubes passing along at the sides of the re,and thehollow `cubical chambers opening into each other, and the hollow walls around the ash-pit, and the cross-iiue below the door of the ash-pit,eon neeting the hollow walls with the cubical chambers, substantially as set forth.

2. The hollow walls for the ash-pit,through which the atmosphere is caused to circulate,

in combination with the ranges of tubes at the sides of the hre-chamber, and the hollow cubical chambers and the flue d, crossing below the ash-door, and the pipe h2, crossing through the bridge-wall, substantially as set forth. i I

3. In combination with the f1re-chambcr and hollow bridge-wall,the ranges of air-tubes at the sides of the furnace, the cubical chambers at the ends of such tubes, connecting one tube with the next, and the tube h2 within the hollow bridge-wall, and passing across from one range of side tubes to the other, substantially as set forth.

4. The hollow bridge-wall andthe tubular cross-bearer at the fire-door, in combination with the grate-bars supported upon ledges, and the perforated air-pipes extending from the tubular cross-bearer tothe hollow bridgewall, and the ranges of air-pipes at the sides of the fire-chamber connecting with the hollow bearer, substantially asset forth.

5. The hollow bridge-wall, in combination with the hollow arch and hollow partition resting upon the bridge-wall, and having connecting openings with the air-space in the' bridge-wall, and openings for the heated air Vto pass into the escaping products of combustion, substantially as set forth.

Signed by me this 3d day of November, A. D. 1883.

WM. o. FORD.

Vitnesses: l

Gno. T. PINcKnnY, WILLIAM G. Morr. 

